Pump.



W. L. HARRISON.

PUMP.

APPLICATION FILED MAY- 21 Patented J ly 22,

mszsu,

l/Vl/E/U T05 iii/21m 11 ffirrz's 0.22.

ATTORNEY to be sprayed.

@ eecifieation of Lev- T 0 all whom ii Hwy, (30 near/2 Be ii: known that i, "WILLL V 1. L. HA2 :1; SON, a citizen of the UnitedShims and resicient of Bianiiorci, in 'the comity oii-iiew Haven and Shiite of co ineeticue 1 vented eel-min new and itiseilrii .miy inveiiiioii relates 170 p1 end i tieuiariy to 211;:- pumps ecap' or use in spraying devices empioylng air 31 sure for the purpose of operaiiing u, pi iiigei. or follower which expcis 31o spraying compound through a suii'ebie outlet.

The object of my present invention is -to improve a pump of iihe above-described character in such, at manner as to render itsvziive readily occessibie and to facilitate and simplify the OPQTA'UOH, particuia riy when it is desired to allow the compressed air to Hf/Q, i'oi (the purpose of allow the plunger ()i follower to be iiiov :d to 11155 ini tial posiiion when the op um-ates is o be refilled wiih he spraying CO1 oimd.

'Two specific embeenmenis oi' the invenfiion are illustrated by the accompanying drawings, in Which Figure l is longitudinai section of :1

,sprayiiog device provided with my iiiiproi'ements; Fig. 9 is detail longitudinal see tion showing the air pump upon an eniarged scale; Fig. 3 is zi'i'o'p View oi the iippzu 'attis; and Fig. -1: shows a Sp flying devicehaving no air pump but embodying my iniiproved valve arm] meni.

A indicates the cylindrical bmiy of iaiie spraying device girovided with a top 01" iiezui I B and Vliii a bottom The letter carries tubular outlet D screw-,i'iii-eiiiied to receive the removable cock E A piuiiger 01' iioilower F of suitable CODStILiCdOTl dividesithe intefiorofihe body A into an, air reservoir A" and a chamber or compartment A adapted to contain the fluid or coiiipoimfii To the follower F maybe attached rods (3 connected with a, ring H,

these perils forming a guide to keep the foi- I iiiiii'lg' obligate position,- uni stop to iimit the movemeni er toward the head B, 910

lower from t aiso fO I'IJ'LHL of the follow fer the description will appiy to both fol-ins of my invention shown in the drawings.

According to Figs. 1 to 3, I provide, W1|Li1- the comp art? e". pump eyiiiicif i A i" ei'iiirsgs' "i' io rec assure c A To the outer opemiting hand meiiy closed i Vithin. "file imiio'w stationary (ieiivei'y speee Pinte." .1 IiiUY-h'li I more eompei "me:

'iiie iattei is secure piston to.

5) an zm imia tubes L, i} ii "the piesv tubefi, head E oi? the oyiimiei" ii wees git its i-i iiei*.end, Wiiii u. hot. the or e ioe (J is I e pim'ideci at "X in eonmining .1 We pres 7 iii airsucked-1111.215 J dilriii the inward sirolie the fIElSiOl'l hiring the onion like sucecefiiiiig inward out of the eessm-e conimimiiai' space i and flowing pest ward stroke Yviii stroke iie forced 'ieitn'ient Ji iiii'i'mg the cheek waive i and iiiieiicii-"yery tube. 0' into the :iir H, zi iispioduping L extends a.

e cheek" I be obwhich the piston rod L passes. TVhen the pump is being operated, the sleeve T is in the position shown in' Fig. 2, its outer end being flush with that of the guide U, so that the threads M will. notengage the threads of the sleeve as thepiston is reciprocated.

The threads will therefore not be injured by the reciprocation of the piston. Vhen the pump is out of use, the sleeve T is .shifted outward so as to project beyond the guide U, and the handle M turned to lock it with the sleeve, as shown in Fig. 1. This is the normal position of the parts, in which the fire extinguisher is ready for use. In this position, with the outer plug N removed, the inner plug N may be given a few turns by means of a screw driver or other suitable tool, to bring a packing N provided ,on the inner surface of the plug, against the end-ofthe tube 0 and of the-casing of the check valve S. The plug N then performs thesalne function as the ordinary cap used inconnection with pneumatic tire valves, that is to say, it prevents the escape of airin case the valve should leak. The outer plug N is then replaced, said plug having a slot to receive the end of a screw driver, and

also havinga central pin N, for a purpose to be stated presently. v r hen the spraying device has been used and itis desired to refill the compartment A? through the outlet D, the follower F must be brought back to its'original position, that is to say, it; must be-pushed toward the head 'B. This may be done'by removing the cock E and pushing a rodthroughthe outlet D, against the: follower Ifi this operation the handle M is generally rested on the floor, the outlet D-pointing upward, and the rod 40 is pushed downward. Since the compressed air contained in the compartmentor reservoir A would make it very hard, if not impossible, to move the follower toward the head B, a suitable vent is opened to allow 'the air to escape from the reservoir A. For this purpose, the plugs N, N are unscrewed and removed from the-piston rod L so as to render the valve S accessible, and the air may be allowed to escape from the reservoir A by opening the valve S in any suitable manner, as by screwing the plug N into the tube or rod L until the pin N engages the customary p rojecting. end of the air Valve and holds it open. The air issulng from the 5 valve will escape past the plug N through a' suitable aperture or channel N.

The position of the valve S is such that with the plunger K and handle 1 in their inner position (Fig. 1), and upon removing the plugs N, N thevalve will be readily accessible, being but a ,short distance from' the opening in the outer surface of the handle. It will therefore be easy to remove the. valve for repairs or renewal, and also to get 6 at it for the purpose of holding the valve gether, the deliverytube 0 being secured -the head B.

plugs N, N which may be of exactly the .air hose with the outer end of the tube 0 when it is desired to tillthe reservoir A with compressed air in this manner. At the same time/the valve is protected against injury etiiciently by the piston rod L and by the handle M. The plug which seals the valve tightly' when desired (Fig. 1) is also placed where it is readily accessible yet efficiently protected bythe handle M, and the plug N which forms an additional protection for the plug N, is itself protected against injury by being countersunk in the handle'M; The latter with the end of the tube 0 thus forms a, protector for the valve S and for the two plugs'N, N

In the form of my inventionillustrated by Fig. 4, the air pump is omitted altoto the center of the head B and the handle or protector M is also rigidly secured to This handle has a screwthreaded axial bore adapted'toreceive the same construction as described above and co operate in the same manner with the check valve S fitted .to the outer end-,of the tube 0. The parts A, C, D, E, F, G, H are supposed to be. of the same construction as in Fig'. 1. .5 The operation is similar to that described with reference to .-Figs. 1, 2 and 3, exceptthat the apparatus embodies no air pump for producing or restoring air-pressure in the reservoir A.

In each construction the valve 5%. which may be used as a filling valve and also as an escape valve, is fully protected vet read ilv accessible. The valve protector performs a similar function with reference .50105 the sealing cap or plug N and to the deflating or venting cap or plug N. Thus, when too the apparatus is stood upon the protector 1n order'to drive the follower F I drwn by means of a rod inserted through the outlet I), there will beno danger of in uring either the valve orthe plugs. lVhile I have shown the valve S at or near the head. and accessible from the end of the apparatus, such valve might be reservoir.

.The handleM may be made of circular or mushroom shape and provided with a number of holes or sockets M .to receive-a suitable hook for suspending the apparatus on a wall. or other support. This is of espeplaced elsewhere on the air 115 ,cial value in a fire extinguisher, which on one side bears a label with instructions for operating the apparatus. Of course, in order to be easily read, this label should be ex actly on the side farthest away from the wall. Inasmuch .as the handle will not always come to a stop in the same position whenit is screwed to the sleeve T, the provision. of a series of holes M enables me 13o visible,

It claim l. A pump provided' with a cylinder, a

,sdelivery tube extending within the cylinder and secured'thereto, an annular piston an ranged to reciprocatein the cylinder out of co tact with" said tube, a ,tubular piston rod tube at a distance tof form f. nuiar chamber in permanent communication with the pressure chamber of the cyli in'der, a delivery valve at that end of the 3c 1 v to the'outer end of the piston rodand prosaid tube which is nearest that endot-the cylinder through whichthe pistonrod projects, and a handle on said projecting portion of the piston rod, said handle being formed with a' longitudinal channel through which access may be had to the said valve.

'2. A. pump provided with a cylinder, an annular is on and a tubular piston rod arranged to reciproc te in said cylinder, a delivery tube extending through the annular piston and into the piston rod but out of contact with both of them, so as to form, between the piston rod and the delivery tube, an annular chamber in permanent communication with'the pressure chamber of the cylinder, an operating handle secured vided with a longitudinal channel leading toward the corresponding end of the de'livery t-ube, a delivery valve at said end of the tube, and means for" normally closing said channel.

' 3.'A pump proygided with a cylinder, an annular piston and av tubular piston rod arranged to reciprocate in said cylinder, a delivery tube extending through said piston and into said piston rod but out of contact with both of them, so as to form, between the piston rod and the delivery tube, an annular chamber in permanent communication withthe pressure'chamber of the cylinder, an operatinghandlc secured to the outer end of the piston rod and provided with a screwthreaded longitudinal channel leading toward the corresponding end of the delivery tube, a delivery valve at said end of the tube, and a removable plug adapted to screw into saidchannel and to form a seal ing: cap for said valve.

A pump provided with a cylinder, an

annular piston and a tubular piston rod arnged to reciprocate 1n sa1d cylinder, I a d QllV-QIY tube extending through sald piston =antl into said piston rod but out ol contact with both of them, so as to form, between the piston rod and the delivery tube, an annular chamber in permanent communication with the pressure chamber of the cylinder, an operating handle secured to the outer end of he piston rod and provided with a screwtl aded longitudinal channel leading into said channel and to form a seali secured to saidpistdir' 'and isurrounding said] herewith anantoward the corresponding end of the delivery tube, a delivery valvc at the sa1d end of the tube, a removable plug adapted to screw,

for 'said valve, and another plug adapted to screw into said chann 1 mg means for openingthe said:

" 5. A pump provided with'a cylili'der,'a

piston arranged to reciprocatein said cylinder,-a tubular piston rod attached to said piston and communicating with the pressure chamber of the cylinder, a delivery tube secured to the pump cylinder, said tube ex tending within the hollow piston rod, a

check valve at the outer end of said tube, 30 and a handle secured to the outerend s the piston rod and provided with an opening or channel through which access may be had to said valve.

6. A pump provided with a cylinder, a piston arranged to reciprocate in said cylinder, a tubular piston rod attached to said piston and communicating with the pressure chamber of the cylindena delivery tube se cured to the pump cylinder, said "tube extending within the hollow piston rod, a check valve at the outer end of said tube, a handle secured to the outer end of the piston red and provided with an opening or chan nel through which access may be had to said valve, and a sealing cap contained in said channel, 7

7. A pump provided with a cylinder, a piston arranged to reciprocate in said cylinder, a tubular piston rod attached to said piston and communicating with the pressure chamber of the cylinder, a delivery tube secured to the pump cylinder, said tube eX- tending within the hollow piston rod, a' check valve at the outer end of said tube, a handle secured to the outer end of the piston rod and provided with an opening or channel through which access maybe had to said valve, means for locking the piston rod against reciprocation, anda cap ar ranged to screw within. said channeliand t seal said valve. I

8. A pump provided-with a cylinder, a piston arranged to reciprocate in said cylinder, a tubular piston rod attached to said piston and commiuiicatin g with the pressure chamber of the cylinder, a delivery tu.be-se- A, cured to the pump cylinder, said tube extending within the hollow piston rod, a check valve at the outer end of said tube, a handle secured to the outer end of the piston rod and provided. with an opening or channel through which access may he had to said valve, a valve-sealing cap and a valve-venting cap contained in said channel.

9. A pump comprisinga cylinder, an annular piston movable therein, a hollow pis-' ton rod'connected with said piston, a deliv-' ery'tube extending into the hollow piston rod, a delivery valve in said delivery tube, and a handle on said piston rod provided with means through which access may be had to said delivery valve.

10. A pump comprising acylindei, a hollow piston rod, an annular piston disposed between said cylinder and piston rod, a de livery tube extending into said hollow pistonrod, a delivery valve on said tube, and a closing-[device for said hollow piston rod, said closing device being adapted to afiord access to' said delivery valve.

11. A pump comprising acylinder, a hollow piston rod, .an' annular piston disposed,

specification 1n the between said cylinder and piston rod, ade- Within said hollow piston'rod said delivery valve. p

In testimony whereof I have signed this or opening ing witnesses. v

WILLIAM L. HARRISON. Witnesses:

PERCY MACKARNESS, E. M. LAU ENCE.

presence of two subscrib- 20 

